1 2 3 and 6 are convex lenses.
What is convex lenses?
- The convex lens is a lens that converges rays of light that convey parallel to its principal axis (i.e. converges the incident rays towards the principal axis) which is relatively thick across the middle and thin at the lower and upper edges.
- The edges are curved outward rather than inward.
To learn more about The convex lens refer:https://brainly.com/question/26961264
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